// 实现这个项目的构建任务
const {src, dest, parallel, series, watch } = require('gulp')
const loadPlugins = require('gulp-load-plugins')
const plugins = loadPlugins()
const browserSync = require('browser-sync')
const bs = browserSync.create()
const del = require('del')


const data = {
    menus: [
      {
        name: 'Home',
        icon: 'aperture',
        link: 'index.html'
      },
      {
        name: 'About',
        link: 'about.html'
      },
      {
        name: 'Contact',
        link: '#',
        children: [
          {
            name: 'Twitter',
            link: 'https://twitter.com/w_zce'
          },
          {
            name: 'About',
            link: 'https://weibo.com/zceme'
          },
          {
            name: 'divider'
          },
          {
            name: 'About',
            link: 'https://github.com/zce'
          }
        ]
      }
    ],
    pkg: require('./package.json'),
    date: new Date()
  }
console.log(plugins)

const clean = () => {
    return del(['dist', 'temp'])
}

const page = () => {
    return src('src/*.html', { base: 'src' })
      .pipe(plugins.swig({ data, defaults: { cache: false } })) // 防止模板缓存导致页面不能及时更新
      .pipe(dest('temp'))
      .pipe(bs.reload({ stream: true }))
}

const style = () => {
    return src('src/assets/styles/*.scss', { base: 'src'})
        .pipe(plugins.sass({ outputStyle: 'expanded'}))
        .pipe(dest('temp'))
        .pipe(bs.reload({ stream: true }))
}

const script = () => {
    return src('src/assets/scripts/*.js', { base: 'src'})
        .pipe(plugins.babel({ presets: ['@babel/preset-env']}))
        .pipe(dest('temp'))
        .pipe(bs.reload({ stream: true}))
}

const font = () => {
    return src('src/assets/fonts/**', { base: 'src' })
        .pipe(plugins.imagemin())
        .pipe(dest('dist'))
    }



const useref = () => {
    return src('temp/*.html', { base: 'temp' })
      .pipe(plugins.useref({ searchPath: ['temp', '.'] }))
       .pipe(plugins.if(/\.js$/, plugins.uglify()))
      .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
      .pipe(plugins.if(/\.html$/, plugins.htmlmin({
        collapseWhitespace: true,
        minifyCSS: true,
        minifyJS: true
      })))
      .pipe(dest('dist'))
    }
  

const image = () => {
    return src('src/assets/images/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const extra = () => {
    return src('public/**', { base: 'public' })
        .pipe(dest('dist'))
    }

const serve = () => {
    watch('src/assets/styles/*.scss', style)
    watch('src/assets/scripts/*.js', script)
    watch('src/*.html', page)

    watch([
        'src/assets/images/**',
        'src/assets/fonts/**',
        'public/**'
      ], bs.reload)
    bs.init({
        server: {
          baseDir: ['temp', 'src', 'public'],
          routes: {
            '/node_modules': 'node_modules'
          }
        }
    })
}

const compile = parallel(page)

const dev = series(compile, serve)

const build =  series(
    clean,
    parallel(
      series(compile, useref),
      image,
      font,
      extra
    )
  )
  
module.exports = {
    page,
    style,
    script,
    image,
    font,
    extra,
    serve,
    useref,
    clean,
    dev,
    build
    
  }